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Organisms and Populations Class 12 MCQs Questions with Answers
Multiple Choice Type Questions
Question 1.
The shifting of an organism temporarily from the stressful habitat to a more hospitable area and return when stressful period is over is called
(a) Suspend
(b) Migrate
(c) Hibernation
(d) Aestivation
Answer
Answer: (b) Migrate
Question 2.
Winter sleep is also called as
(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation
Answer
Answer: (a) Hibernation
Question 3.
To avoid summer-related problems – heat and desiccation by organism is called
(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation
Answer
Answer: (d) Aestivation
Question 4.
A stage of suspended development is called
(a) Diapause
(b) Suspend
(c) Migrate
(d) Aestivation
Answer
Answer: (a) Diapause
Question 5.
Both the species benefit in
(a) Parasitism
(b) Mutualism
(c) Competition
(d) Predation
Answer
Answer: (b) Mutualism
Question 6.
Both species lose in
(a) Mutualism
(b) Competition
(c) Parasitism
(d) Predation
Answer
Answer: (b) Competition
Question 7.
One species benefit in
(a) Parasitism
(b) Predation
(c) Mutualism
(d) Both (a) and (b)
Answer
Answer: (d) Both (a) and (b)
Question 8.
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called
(a) Commensalism
(b) Amensalism
(c) Mutualism
(d) None of the above
Answer
Answer: (a) Commensalism
Question 9.
If one species is harmed whereas the other is unaffected is called
(a) Commensalism
(b) Amensalism
(c) Mutualism
(d) None of the above
Answer
Answer: (a) Commensalism
Question 10.
Parasites that feed on the external surface of the host organism are called
(a) Ecto parasites
(b) Endo parasites
(c) Brood parasitism
(d) None of the above
Answer
Answer: (a) Ecto parasites
Question 11.
Parasites that live inside the host body at different sities are called
(a) Ecto parasites
(b) Endo parasites
(c) Brood parasitism
(d) None of the above
Answer
Answer: (b) Endo parasites
Question 12.
The number of birth during a given period in the population that are added to the initial density is referred to
(a) Natality
(b) Mortality
(c) Sex-ratio
(d) None of the above
Answer
Answer: (a) Natality
Question 13.
The number of deaths in the population during a given period is referred to
(a) Natality
(b) Mortality
(c) Sex-ratio
(d) None of the above
Answer
Answer: (b) Mortality
Question 14.
The size of the population tells us a lot about its status in the
(a) Environment
(b) Sex-ratio
(c) Age pyramid
(d) Habitat
Answer
Answer: (d) Habitat
Question 15.
For human population, the age pyramids generally show age distribution of
(a) Only males
(b) Only females
(c) Of males and females
(d) None of the above
Answer
Answer: (c) Of males and females
Fill in the Blanks
Question 1.
Both species benefit in ………………..
Answer
Answer: mutualism
Question 2.
Both species lose in ………………..
Answer
Answer: competition
Question 3.
Only one species benefits in ………………..
Answer
Answer: parasitism
Question 4.
The interaction where one species is benefitted and the other is neither benefitted nor harmed is called ………………..
Answer
Answer: commensalism
Question 5.
One species is harmed whereas the other is unaffected is called ………………..
Answer
Answer: amensalism
Question 6.
Winter sleep is called ………………..
Answer
Answer: hibernation
Question 7.
……………….. interactions arise from the interaction of populations of two different species.
Answer
Answer: Interspecific
Question 8.
Lice is a ………………..
Answer
Answer: ectoparasite
Question 9.
Tapeworm is a ………………..
Answer
Answer: endoparasite
Question 10.
Squid is an example of ……………….. zone.
Answer
Answer: bentic
Write True or False
Question 1.
The number of births during a given period in the population that are added to the initial density is referred to as natality.
Answer
Answer: True
Question 2.
Winter sleep is called aestivation.
Answer
Answer: False
Question 3.
A stage of suspended development is called hibernation.
Answer
Answer: False
Question 4.
Opuntia is a desert plant.
Answer
Answer: True
Question 5.
Organisms can live is pressure greater than 100 times the normal pressure.
Answer
Answer: True
Question 6.
All organisms cannot tolerate a wide range of salinities.
Answer
Answer: False
Question 7.
The nature of properties of soil in different places vary.
Answer
Answer: True
Question 8.
Many fresh water animals cannot lie for long in sea water due to the salinity of sea water.
Answer
Answer: False
Question 9.
Lice is an example of endo parasite.
Answer
Answer: False
Question 10.
The female mosquito is not considered a parasite.
Answer
Answer: True
One Word Questions
Question 1.
Name a plant of the desert region.
Answer
Answer: Cactus.
Question 2.
Give an example of ectoparasite.
Answer
Answer: Lice.
Question 3.
Give an example of endoparasite.
Answer
Answer: Tapeworm.
Question 4.
Give an example of bentic zone.
Answer
Answer: Squid.
Question 5.
The process by which plant manufacture their food.
Answer
Answer: Photosynthesis.
Question 6.
What is the per cent of salt in inland water?
Answer
Answer: 5 per cent.
Question 7.
What is the per cent of salt in hypersaline lagoons?
Answer
Answer: > 100.
Question 8.
What is the stage of suspended development called?
Answer
Answer: Diapause.
Question 9.
Name a butterfly which is highly distasteful to its predator.
Answer
Answer: Monarch butterfly.
Question 10.
Name a starfish which is an important predator in the rocky intertidal communities of the American Pacific Coast.
Answer
Answer: Pisaster.
Match the Following
Column I | Column II |
1. Temporary moving from one place to another | A. Hibernation |
2. Winter sleep | B. Diapause |
3. A stage of suspended development | C. Aestivation |
4. Avoid summer heat | D. Commensalism |
5. One species benefit in | E. Migration |
Answer
Answer:
Column I | Column II |
1. Temporary moving from one place to another | E. Migration |
2. Winter sleep | A. Hibernation |
3. A stage of suspended development | B. Diapause |
4. Avoid summer heat | C. Aestivation |
5. One species benefit in | D. Commensalism |
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